EP1056739B1 - Novel cyclic pro-perfumes having modifiable fragrance raw material alcohol release rate - Google Patents

Novel cyclic pro-perfumes having modifiable fragrance raw material alcohol release rate Download PDF

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Publication number
EP1056739B1
EP1056739B1 EP99906824A EP99906824A EP1056739B1 EP 1056739 B1 EP1056739 B1 EP 1056739B1 EP 99906824 A EP99906824 A EP 99906824A EP 99906824 A EP99906824 A EP 99906824A EP 1056739 B1 EP1056739 B1 EP 1056739B1
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substituted
unsubstituted
methyl
dimethyl
pro
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German (de)
French (fr)
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EP1056739A1 (en
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Greg Scot Miracle
Kenneth Price Price
Lon Montgomery Gray
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Procter and Gamble Co
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Procter and Gamble Co
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H9/00—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical
    • C07H9/02—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical the hetero ring containing only oxygen as ring hetero atoms
    • C07H9/04—Cyclic acetals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
    • C07D317/10—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings
    • C07D317/32—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D317/34—Oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
    • C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
    • C07D317/72—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 spiro-condensed with carbocyclic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/04—1,3-Dioxanes; Hydrogenated 1,3-dioxanes
    • C07D319/06—1,3-Dioxanes; Hydrogenated 1,3-dioxanes not condensed with other rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/04—1,3-Dioxanes; Hydrogenated 1,3-dioxanes
    • C07D319/08—1,3-Dioxanes; Hydrogenated 1,3-dioxanes condensed with carbocyclic rings or ring systems
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B9/00—Essential oils; Perfumes
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B9/00—Essential oils; Perfumes
    • C11B9/0069—Heterocyclic compounds
    • C11B9/0073—Heterocyclic compounds containing only O or S as heteroatoms

Definitions

  • the present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol, preferably a tertiary fragrance raw material alcohol.
  • the novel pro-perfumes of the present invention can be modified by the formulator to control the rate at which the fragrance raw material alcohol is released once the material is applied, for example, to human skin.
  • fragrance raw materials are no longer derived from natural sources but are synthesized by modern chemical methods as highly pure fragrance raw materials (FRM). These FRM's are currently formulated to produce fine perfumes, colognes, eau de toilettes, after-shave lotions, and other personal fragrance compositions.
  • FRM perfume raw materials
  • Perfumes containing cyclic orthoesters are known from GB-A-2 018 251. Those skilled in the art of preparing these fragrance-containing compositions have categorized fragrances into three types based on their relative volatility; top, middle, and base notes.
  • Top, middle, and base notes each serve a different purpose in the blending of fragrances and when properly formulated produce a "balanced fragrance" composition Based on volatility, these notes are described by those skilled in the art as: the base notes having the most long lasting aroma; the middle notes, have a medium volatility; and the top notes are the most volatile. Key to successfully formulating a fragrance-containing composition is the precise balance between these three groups of materials producing a fragrance-containing composition that diffuses during its evaporation in a manner which has an aesthetic quality.
  • fragrance raw materials especially fragrance raw material alcohols
  • formulators have not been able to well control the rate at which fragrance raw materials, especially fragrance raw material alcohols, are released when applied, for example, on human skin, hair, etc. Therefore, there has been a long felt need for a means of releasing at least one fragrance raw material alcohol, preferably tertiary alcohols, at a controllable rate.
  • novel cyclic pro-perfumes which are the subject matter of the present invention, can not only release fragrance raw material alcohols but can be modified to release said alcohols within a range of time desirable to the formulator.
  • the cyclic pro-perfumes described herein are capable of delivering highly desirable tertiary alcohols.
  • the present invention meets the aforementioned needs in that it has been surprisingly discovered than certain cyclic pro-perfumes can be modified to release their fragrance raw material alcohols at variable rates after being exposed to an acid milieu inter alia human skin.
  • a first aspect of the present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol, said pro-perfumes having the formula: wherein -OR is a unit derived from a fragrance raw material alcohol selected from those listed hereinafter; R 1 is hydrogen, C 1 -C 22 alkyl, C 1 -C 22 alkenyl, C 6 -C 12 aryl, alkylenearyl, and substituted or unsubstituted alkyleneoxyalkyl; R 2 , R 3 , R 4 , and R 5 are each independently selected from hydrogen, C 1 -C 30 substituted or unsubstituted linear alkyl, C 3 -C 30 substituted or unsubstituted branched alkyl, C 3 -C 30 substituted or unsubstituted cyclic alkyl, C 2 -C 30 substituted or unsubstituted linear alkenyl, C 3 -C 30 substituted or unsubstituted branche
  • R 3 and R 5 are each hydrogen. Also preferably in the above formula, R 2 and R 4 are each taken together to form a fused ring. In another preferred embodiment, R 2 and R 4 are each independently selected from hydrogen, C 1 -C 10 substituted or unsubstituted linear alkyl, C 3 -C 30 substituted or unsubstituted cyclic alkyl, substituted or unsubstituted alkylene aryl and C 6 -C 10 substituted or unsubstituted aryl.
  • the present invention also relates to fine fragrance compositions inter alia perfumes, colognes, after shaves, and eau de toilettes comprising said cyclic pro-perfumes.
  • personal care and personal hygiene articles may comprise the cyclic pro-perfumes described herein.
  • Non-limiting examples of these personal care items include deodorants, body lotions or creams, sun tan lotions, and shampoos.
  • the present invention also relates to a fragrance delivery system which comprises at least one cyclic pro-perfume as described herein.
  • a fragrance delivery system which comprises at least one cyclic pro-perfume as described herein.
  • said fragrance delivery system delivers at least one tertiary fragrance raw material alcohol.
  • the present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol.
  • the cyclic pro-perfumes of the present invention are capable of releasing in a controlled manner desirable tertiary perfume raw material alcohols inter alia linalool, ethyllinalool, dihydromyrcenol, and tetrahydrolinalool.
  • the pro-perfumes of the present invention are essentially orthoesters.
  • Orthoesters in general, may be considered to be "acetals" of carboxylic acid esters which can be formed by the reaction of an ester with two equivalents of alcohol. Treatment of orthoesters with sufficient acid catalyst in the presence of moisture results in the "reversion” of orthoesters back into a mixture of ester and alcohol.
  • the ester alcohol is not the same as the orthoester forming alcohol, and depending upon the structure and reactivity of the orthoester components, one of the alcohols released from the reversion reaction may be the original ester alcohol resulting in one of the "orthoester forming" alcohols now comprising the ester. In this instance, "transesterification" has occurred.
  • the release rate of the fragrance raw material alcohol from the cyclic orthoesters of the present invention may be controlled, for example, by adjusting, separately or in combination, either the relative basicity of the orthoester oxygen atoms in the cyclic moiety or the torsional ring strain of the resulting cyclic orthoesters.
  • One result of these adjustments is to provide increased or decreased ring opening kinetics and thereby a means for regulating the release rate of the fragrance raw material alcohol.
  • the cyclic pro-perfumes of the present invention have the formula: wherein the moiety -OR is derived from a fragrance raw material alcohol having the general formula ROH.
  • Fragrance raw material alcohols which can be suitably released by the cyclic pro-perfumes of the present invention are 2,4-dimethyl-3-cyclohexene-1-methanol (Floralol), 2,4-dimethyl cyclohexane methanol (Dihydro floralol), 5,6-dimethyl-1-methylethenylbicyclo-[2.2.1]hept-5-ene-2-methanol (Arbozol), 2,4,6-trimethyl-3-cyclohexene-1-methanol (Isocyclo geraniol), 4-(1-methylethyl)cyclohexanemethanol (Mayol), ⁇ -3,3-trimethyl-2-norborane.
  • methanol 1,1-dimethyl-1-(4-methylcyclohex-3-enyl)methanol
  • Preferred fragrance raw material alcohols are tertiary alcohols inter alia 3,7-dimethyl-1,6-octadien-3-ol (linalool), 3,7-dimethyloctan-3-ol (tetrahydrolinalool), 3,7-dimethyl-1,6-nonadien-3-ol (ethyllinalool), and 2,6-dimethyl-7-octen-2-ol (dihydromyrcenol).
  • R 1 is hydrogen, C 1 -C 22 alkyl, C 1 -C 22 alkenyl, C 6 -C 12 aryl, alkylenearyl, and substituted or unsubstituted alkyleneoxyalkyl.
  • R 1 is hydrogen, C 1 -C 4 alkyl, alkylenearyl; more preferably hydrogen, methyl, ethyl, propyl, iso-propyl, t-butyl, phenyl, substituted phenyl, benzyl and substituted benzyl.
  • R 2 , R 3 , R 4 , and R 5 are each independently hydrogen, C 1 -C 30 substituted or unsubstituted linear alkyl, C 3 -C 30 substituted or unsubstituted branched alkyl, C 3 -C 30 substituted or unsubstituted cyclic alkyl, C 2 -C 30 substituted or unsubstituted linear alkenyl, C 3 -C 30 substituted or unsubstituted branched alkenyl, C 3 -C 30 substituted or unsubstituted cyclic alkenyl, C 2 -C 30 substituted or unsubstituted linear alkynyl, C 3 -C 30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C 6 -C 30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted
  • any two R 2 , R 3 , R 4 , or R 5 units can be taken together to form a fused ring cyclic pro-perfume having from 3 to 8 carbon atoms and optionally one or more heteroatoms in the ring.
  • An example of a fused ring cyclic pro-perfume includes the general formulae: The fused rings may also optionally comprise one or more heteroatoms, preferably oxygen, nitrogen, sulfur and mixtures thereof.
  • R 8 is independently hydrogen, C 1 -C 22 alkyl, hydrogen, C 1 -C 30 substituted or unsubstituted linear alkyl, C 3 -C 30 substituted or unsubstituted branched alkyl, C 3 -C 30 substituted or unsubstituted cyclic alkyl, C 2 -C 30 substituted or unsubstituted linear alkenyl, C 3 -C 30 substituted or unsubstituted branched alkenyl, C 3 -C 30 substituted or unsubstituted cyclic alkenyl, C 2 -C 30 substituted or unsubstituted linear alkynyl, C 3 -C 30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C 6 -C 30 substituted or unsubstituted
  • Non-limiting examples of saccharide units according to the present invention include erythrose, threose, arabinose, ribose, lysose, xylose, glucose, mannose, allose, altrose, talose, galactose, idose, gulose, fructose, and combinations thereof.
  • the saccharides of the present invention are preferably in the pyranose (closed ring) form, however, when in solution, an equilibrium may exist wherein some of the material may exist in the non-preferred ring opened form. Any number of saccharides can be linked together. For example, oligosaccharide - two or three saccharides or polysaccharides - more than three saccharides, are suitable for use in the present invention.
  • the cyclic pro-perfumes of the present invention further comprise spiroannulated rings having from 3 to 8 carbon atoms and optionally one or more heteroatoms in the ring, examples of which have the general formulae: wherein said fused ring or spiroannulated ring cyclic pro-perfumes may have their rings further substituted by one or more units, said units are independently hydroxyl, C 1 -C 22 alkoxy, C 1 -C 22 alkyl, C 1 -C 22 alkenyl, C 6 -C 12 aryl, and alkylenearyl units.
  • the fused rings may also comprise one or more aromatic rings, including heteroaromatic rings. Examples of aromatic and heteroaromatic rings include benzene, naphthalene, pyridine, quinoline, isoquinoline, etc.
  • R 2 , R 3 , R 4 , and R 5 are selected such that said units comprise a vicinal diol or 1,3-type diol.
  • R 2 , R 3 , R 4 , and R 5 derive from diols non-limiting examples of which, include 1,2- propanediol, 1,2-butanediol, 1,2-hexanediol, 1,2-octanediol, 1,3-hydroxyacetone, 1,3-octanediol. All of the preceding examples of diols include a hydroxy moiety at the terminus or the alkyl chain. However, as described herein below, non-terminal hydroxy diols are also preferred.
  • R 6 and R 7 are independently hydrogen (wherein the moiety -CR 6 R 7 - is a methylene unit), hydroxyl, nitro, nitrilo, C 1 -C 30 substituted or unsubstituted linear alkyl, C 3 -C 30 substituted or unsubstituted branched alkyl, C 3 -C 30 substituted or unsubstituted cyclic alkyl, C 2 -C 30 substituted or unsubstituted linear alkenyl, C 3 -C 30 substituted or unsubstituted branched alkenyl, C 3 -C 30 substituted or unsubstituted cyclic alkenyl, C 2 -C 30 substituted or unsubstituted linear alkynyl, C 3 -C 30 substituted or unsubstituted branched alkynyl, substituted or unsubsti
  • the resulting spiroannulated or fused rings may be further substituted by one or more C 1 -C 22 alkyl, C 1 -C 22 alkenyl, C 6 -C 12 aryl, and alkylenearyl units.
  • n is an integer from 0 to 3, preferably 0 or 1, more preferably 0.
  • substituted or unsubstituted alkyleneoxy units are defined as moieties having the formula: wherein R 5 is hydrogen; R 6 is hydrogen, methyl, ethyl, and mixtures thereof; the index x is from 1 to about 20.
  • substituted or unsubstituted alkyleneoxyalkyl are defined as moieties having the formula: wherein R 5 is hydrogen, C 1 -C 18 alkyl, C 1 -C 4 alkoxy, and mixtures thereof; R 6 is hydrogen, methyl, ethyl, and mixtures thereof; the index x is from 1 to about 20 and the index y is from 2 to about 30.
  • substituted or unsubstituted alkylenearyl units are defined as moieties having the formula: wherein R 5 and R 6 are each independently hydrogen, hydroxy, C 1 -C 4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H; -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, p is from 1 to about 34.
  • substituted or unsubstituted aryloxy units are defined as moieties having the formula: wherein R 5 and R 6 are each independently hydrogen, hydroxy, C 1 -C 4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H, -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, alkylamino, and mixtures thereof.
  • substituted or unsubstituted alkyleneoxyaryl units are defined as moieties having the formula: wherein R 5 and R 6 are each independent ly hydrogen, hydroxy, C 1 -C 4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H, -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, q is from 1 to about 34.
  • substituted or unsubstituted oxyalkylenearyl units are defined as moieties having the formula: wherein R 5 and R 6 are each independently hydrogen, hydroxy, C 1 -C 4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO, -CO 2 H, -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, w is from 1 to about 34.
  • a formulator wishing to increase the degree of torsional strain in the pro-perfume ring may, however, select a diol having two non-terminus alcohols, for example, 2,3-octanediol or 3,4-octandiol.
  • the increase or decrease in the torsional strain of the cyclic pro-perfume ring provides the formulator with a means for adjusting the rate at which the fragrance raw material alcohol is released by the cyclic orthoester.
  • the two cyclic pro-perfumes having the formulae: will exhibit different release rates of perfume raw material alcohol ROH due in part to the torsional strain provided by the eclipsing interaction of the methyl group with the alkyl chain.
  • the present invention further relates to fragrance delivery systems comprising:
  • pro-perfumes, pro-fragrances, or pro-accords which are combinable with the cyclic pro-perfumes of the present invention are preferably the pro-accords.
  • the term "accord” as used herein is defined as "a mixture of two or more 'fragrance raw materials' which are artfully combined to impart a pleasurable scent, odor, essence, or fragrance characteristic". Therefore a material which is a "pro-accord” is capable of releasing a mixture of fragrance raw materials or a fragrance accord.
  • pro-accords and pro-fragrances include orthoesters, acetals, ketals, orthocarbonates, and the like described herein below.
  • the cyclic pro-perfumes of the present invention When formulated into a fragrance delivery system, will comprise from about 0.1% to about 99%, preferably from about 1% to about 50% by weight, of said fragrance delivery system.
  • the fragrance delivery systems of the present invention preferably comprise the pro-accords described herein below.
  • said pro-accords comprise singly or as an admixture from 0.1% to about 99%, preferably from about 1% to about 50% by weight of the fragrance delivery system.
  • the fragrance delivery systems of the present invention further comprises carriers, fixatives, and other adjunct ingredients which can be added in any suitable amount or ratio to the cyclic pro-perfumes or the optional pro-accords which comprise the balance of the delivery system.
  • Typical carriers are methanol, ethanol (preferred), iso-propanol, polyethylene glycol, as well as water in some instances.
  • Fixatives serve to lower the volatility of certain top and middle notes in order to extend their contact time on skin.
  • Adjunct ingredients include perfume raw material components which are essential oils and are therefore not a single chemical entity.
  • the adjunct ingredients may be mixtures of synthetic fragrance raw materials which serve a further purpose in addition to providing a pleasurable odor.
  • One class of preferred compounds useful as pro-accords according to the present invention are orthoesters having the formula: wherein hydrolysis of the orthoester releases fragrance raw material components according to the following scheme: wherein R is hydrogen, C 1 -C 8 linear alkyl, C 4 -C 20 branched alkyl, C 6 -C 20 cyclic alkyl, C 6 -C 20 branched cyclic alkyl, C 6 -C 20 linear alkenyl, C 6 -C 20 branched alkenyl, C 6 -C 20 cyclic alkenyl, C 6 -C 20 branched cyclic alkenyl, C 6 -C 20 substituted or unsubstituted aryl, preferably the moieties which substitute the aryl units are alkyl moieties, preferably R is hydrogen, methyl, ethyl, and phenyl.
  • R 1 , R 2 and R 3 are independently C 1 -C 20 linear, branched, or substituted alkyl; C 2 -C 20 linear, branched, or substituted alkenyl; C 5 -C 20 substituted or unsubstituted cyclic alkyl; C 6 -C 20 substituted or unsubstituted aryl, C 2 -C 40 substituted or unsubstituted alkyleneoxy; C 3 -C 40 substituted or unsubstituted alkyleneoxyalkyl; C 6 -C 40 substituted or unsubstituted alkylenearyl; C 6 -C 32 substituted or unsubstituted aryloxy, C 6 -C 40 substituted or unsubstituted alkyleneoxyaryl; and C 6 -C 40 oxyalkylenearyl.
  • substituted herein is meant "compatible moieties which replace a hydrogen atom".
  • substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H; -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R 1 is C 1 -C 12 linear or branched alkyl), amino, and C 1 -C 12 mono- and dialkylamino.
  • Another class of compound useful as pro-accords according to the present invention are acetals and ketals having the formula: wherein hydrolysis of the acetal or ketal releases one equivalent of aldehyde or ketone and two equivalents of alcohol according to the following scheme: wherein R is C 1 -C 20 linear alkyl, C 4 -C 20 branched alkyl, C 6 -C 20 cyclic alkyl, C 6 -C 20 branched cyclic alkyl, C 6 -C 20 linear alkenyl, C 6 -C 20 branched alkenyl, C 6 -C 20 cyclic alkenyl, C 6 -C 20 branched cyclic alkenyl, C 6 -C 20 substituted or unsubstituted aryl, preferably the moieties which substitute the aryl units are alkyl moieties.
  • R 1 is hydrogen, R, or in the case wherein the pro-accord is a ketal, R and R 1 can be taken together to form a ring.
  • R 2 and R 3 are independently selected from the group consisting of C 5 -C 20 linear, branched, or substituted alkyl; C 4 -C 20 linear, branched, or substituted alkenyl; C 5 -C 20 substituted or unsubstituted cyclic alkyl; C 6 -C 20 substituted or unsubstituted aryl, C 2 -C 40 substituted or unsubstituted alkyleneoxy; C 3 -C 40 substituted or unsubstituted alkyleneoxyalkyl; C 6 -C 40 substituted or unsubstituted alkylenearyl; C 6 -C 32 substituted or unsubstituted aryloxy; C 6 -C 40 substituted or unsubstituted alkyleneoxyaryl; and C 6 -C 40 oxyalkyleneary
  • substituted herein is meant "compatible moieties which replace a hydrogen atom".
  • substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H; -CO 2 R';-CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, and C 1 -C 12 mono- and dialkylamino.
  • Another class of preferred compounds useful as pro-accords according to the present invention are orthocarbonates having the formula: wherein hydrolysis of the orthoester releases the fragrance raw material components according to the following scheme: which can continue to hydrolyze and further release two equivalents of one or more fragrance raw material alcohol according to the following scheme: thereby providing up to four equivalents of fragrance raw material alcohol per equivalent of delivered orthocarbonate, wherein R 1 , R 2 , R 3 , and R 4 are independently C 1 -C 20 linear, branched, or substituted alkyl; C 2 -C 20 linear, branched, or substituted alkenyl; C 5 -C 20 substituted or unsubstituted cyclic alkyl; C 6 -C 20 substituted or unsubstituted aryl, C 2 -C 40 substituted or unsubstituted alkyleneoxy; C 3 -C 40 substituted or unsubstituted alkyleneoxyalkyl; C 6 -C 40 substituted or unsubstituted alkyleneary
  • substituted herein is meant "compatible moieties which replace a hydrogen atom".
  • substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO 2 H; -CO 2 R'; -CONH 2 ; -CONHR'; -CONR' 2 ; wherein R' is C 1 -C 12 linear or branched alkyl), amino, and C 1 -C 12 mono- and dialkylamino.
  • the cyclic pro-perfumes and other pro-accords useful in the fragrance delivery systems of the present invention generally have a delayed release of final fragrance accord in order to achieve the increased fragrance longevity benefits described herein.
  • the pro-accords generally also deliver the fragrance accords during a time period useful to the formulator, for example, within a time period desirable to the consumer.
  • the pro-accords generally have a "Fragrance Release Half-life" of less than or equal to 12 hours when measured in NaH 2 PO 4 buffer at pH 2.5 and greater than or equal to 0.1 hour when measured in NaH 2 PO 4 buffer at pH 5.3.
  • the "Fragrance Release Half-life” is defined herein as follows.
  • Pro-accords deliver their corresponding mixture of fragrance raw materials or fragrance accords according to the equation: Pro-Accord ⁇ Accord wherein the accord which is released may be a binary accord or a multiple fragrance raw material accord.
  • t 1/2 0.693 k and this relationship is used for the purposes of the present invention to determine the "fragrance Release Half-life" (FRHL).
  • t 1/2 and k are determined in a mixture of 90/10 dioxane/phosphate buffered water.
  • An example of the procedure used to measure the suitability of a pro-accord for use in the fragrance delivery systems at pH 2.5 is as follows.
  • the phosphate buffered water is prepared by admixing 3.95 mL of 85% phosphoric acid (H 3 PO 4 ) and 24 g of sodium dihydrogen phosphate (NaH 2 PO 4 ) with one liter of water. The pH of this solution is approximately 2.5.
  • 10 mL of the phosphate buffer is admixed with 90 mL of dioxane and the pro-fragrance to be analyzed is added.
  • the hydrolysis kinetics are then monitored by conventional HPLC at 30° C.
  • the pro-accord component of the present invention in order to assure the stability of acid labile pro-accords, may include a source of reserve alkalinity equivalent to at least 0.001 molar (1 milli-molar) sodium hydroxide.
  • This reserve alkalinity generally serves to prevent premature release of the fragrance raw materials by the pro-accords prior to exposure of the pro-accords to skin.
  • a reserve alkalinity of at least 0.001 molar is defined as "the amount of alkaline material present in one liter of the second component when placed in an equivalent volume of water, would produce a hydroxide ion equivalent of 0.001 moles or greater".
  • 0.0004 g of NaOH present in a 10 mL aliquot of the second component would produce a reserve alkalinity of at least 0.001 molar.
  • Suitable sources of alkalinity are the alkali metal and alkali earth hydroxides.
  • other suitable sources of alkalinity can be used which are compatible with the pro-accords of the "pro-accord component".
  • fragrance delivery system of the present invention may be suitably use in a fine fragrance composition.
  • Said perfume compositions provide extended fragrance character impressions, and comprise:
  • Acetobromoglucose, tetrabutylammonium bromide (0.3 equiv), and ethyllinalool (3 equiv) are suspended in dry collidine and stirred at 65 °C for 3 days.
  • the reaction mixture is diluted with 2 volumes of ether, washed twice with water, and then dried (MgSO 4 ), evaporated, and purified by flash chromatography.
  • the cyclic pro-perfumes of the present invention are also suitable for use in personal care and personal hygiene compositions.
  • the following are examples of a personnel cleanser composition which is prepared by combining the following ingredients using conventional mixing techniques.
  • Weight % Ingredients 3 4 5 6 Phase A Water QS 100 QS 100 QS 100 QS 100 Disodium EDTA 0.100 0.100 0.100 0.100 Glycerin 4.00 4.00 4.00 4.00 Methylparaben 0.200 0.200 0.200 0.200 C 10 -C 30 alkyl acrylate crosspolymer 0.150 0.150 0.150 0.150 Carbomer 954 0.250 0.250 0.250 0.250 Phase B Stearic Acid 0.110 0.110 0.110 0.110 0.110 Stearyl alcohol 0.875 0.875 0.875 Cetyl alcohol 0.875 0.875 0.875 Propylparaben 0.150 0.150 0.150 Steareth-2 -- 0.25 0.25 0.25 Steareth-21 -- 0.50 0.50 0.50 0.50 Phase C Sodium hydroxide 0.130 0.130 0.130 0.130
  • Examples 3-6 can be suitably prepared as follows.
  • the Phase A ingredients are mixed at room temperature to form a dispersion and heated with stirring to 70-80° C.
  • Phase B is heated with stirring to 70-80° C.
  • Phase B is then added to Phase A with mixing to form the emulsion.
  • Phase C is added to neutralize the composition.
  • the Phase D ingredients are added with mixing, followed by cooling to 45-50° C.
  • the Phase E ingredients are then added with stirring, followed by cooling to 40° C.
  • Phase F is heated with mixing to 40° C and added to the emulsion, which is cooled to room temperature.
  • the resulting cleansing composition is useful for cleansing the skin.
  • the emulsion de-emulsifies upon contact with the skin.

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Description

  • The present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol, preferably a tertiary fragrance raw material alcohol. The novel pro-perfumes of the present invention can be modified by the formulator to control the rate at which the fragrance raw material alcohol is released once the material is applied, for example, to human skin.
    • BACKGROUND OF THE INVENTION
  • Humans have applied scents and fragrances to their skin since antiquity. Originally these aesthetically pleasing materials were commonly isolated in raw form as resins, gums or essential oils from natural sources, inter alia, the bark, roots, leaves and fruit of indigenous plants. These resins, gums, and oils were directly applied to the body or diluted with water or other solvent, including in some cases, wine. With the advent of modern chemistry, individual components responsible for the odor properties of these resins, gums and oils were isolated and subsequently characterized. Modern perfumery involves the artful compounding of fragrance materials to achieve novel fragrance compositions having defined "characteristics".
  • Many modern fragrances are no longer derived from natural sources but are synthesized by modern chemical methods as highly pure fragrance raw materials (FRM). These FRM's are currently formulated to produce fine perfumes, colognes, eau de toilettes, after-shave lotions, and other personal fragrance compositions. Perfumes containing cyclic orthoesters are known from GB-A-2 018 251. Those skilled in the art of preparing these fragrance-containing compositions have categorized fragrances into three types based on their relative volatility; top, middle, and base notes.
  • Top, middle, and base notes each serve a different purpose in the blending of fragrances and when properly formulated produce a "balanced fragrance" composition Based on volatility, these notes are described by those skilled in the art as: the base notes having the most long lasting aroma; the middle notes, have a medium volatility; and the top notes are the most volatile. Key to successfully formulating a fragrance-containing composition is the precise balance between these three groups of materials producing a fragrance-containing composition that diffuses during its evaporation in a manner which has an aesthetic quality.
  • It has been the goal of those skilled in the art of perfumes and fragrances to provide aesthetically pleasant odor compositions wherein the initial top, middle, and base note balance is maintained for an extended period of time. Due to the uneven rate of evaporation of the components which comprise a fine perfume or fragrance, the initial fragrance may be quite different than the aroma perceived several hours later. This problem is solved in many different ways by the user. One method is to "load up" on the perfume initially and rely on the natural evaporation rate to diminish the fragrance to a suitable level several hours later when the desired effect is needed. Another method which is used is to continually renew the fragrance by reapplying small amounts of the perfume to the skin at short time intervals. Neither of these solutions is adequate to overcome the diminishing level of top and middle notes over time. In fact, base notes which are present over a protracted period by virtue of their low volatility, begin to accumulate with each "re-freshing" of perfume. After some time these base notes overwhelm the other fragrance notes and destroy the original fragrance balance.
  • However, despite these artful approaches and compensating for the physical properties of perfume ingredients, formulators have not been able to well control the rate at which fragrance raw materials, especially fragrance raw material alcohols, are released when applied, for example, on human skin, hair, etc. Therefore, there has been a long felt need for a means of releasing at least one fragrance raw material alcohol, preferably tertiary alcohols, at a controllable rate.
  • It has now been surprisingly discovered that the novel cyclic pro-perfumes, which are the subject matter of the present invention, can not only release fragrance raw material alcohols but can be modified to release said alcohols within a range of time desirable to the formulator. In addition. the cyclic pro-perfumes described herein are capable of delivering highly desirable tertiary alcohols.
    • SUMMARY OF THE INVENTION
  • The present invention meets the aforementioned needs in that it has been surprisingly discovered than certain cyclic pro-perfumes can be modified to release their fragrance raw material alcohols at variable rates after being exposed to an acid milieu inter alia human skin.
  • A first aspect of the present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol, said pro-perfumes having the formula:
    Figure 00030001
    wherein -OR is a unit derived from a fragrance raw material alcohol selected from those listed hereinafter; R1 is hydrogen, C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, alkylenearyl, and substituted or unsubstituted alkyleneoxyalkyl; R2, R3, R4, and R5 are each independently selected from hydrogen, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, substituted or unsubstituted alkylenearyl, and substituted or unsubstituted alkyleneoxyaryl, or any two R2, R3, R4, or R5 can be taken together to form a fused ring or spiroannulated ring having from 3 to 8 carbons and optionally one or more heteroatoms in said ring, said ring is optionally farther substituted by one or more C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, and alkylenearyl units, and mixtures thereof; Y is -CR6R7-, C=O, and mixtures thereof, wherein R6 and R7 are independently hydrogen, hydroxyl, nitro, nitrilo, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, substituted or unsubstituted alkylenearyl, and substituted or unsubstituted alkyleneoxyaryl, or R6 and R7 can be taken together to form a spiroannulated ring or taken together with any R2, R3, R4, or R5 to form a fused ring, said spiroannulated or fused ring having from 3 to 8 carbons and optionally one or more heteroatoms in said ring, said ring further optionally substituted by one or more C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, and alkylenearyl units, and n is from 0 to 3. Preferably in the above formula, R3 and R5 are each hydrogen. Also preferably in the above formula, R2 and R4 are each taken together to form a fused ring. In another preferred embodiment, R2 and R4 are each independently selected from hydrogen, C1-C10 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, substituted or unsubstituted alkylene aryl and C6-C10 substituted or unsubstituted aryl.
  • The present invention also relates to fine fragrance compositions inter alia perfumes, colognes, after shaves, and eau de toilettes comprising said cyclic pro-perfumes. In addition, personal care and personal hygiene articles may comprise the cyclic pro-perfumes described herein. Non-limiting examples of these personal care items include deodorants, body lotions or creams, sun tan lotions, and shampoos.
  • The present invention also relates to a fragrance delivery system which comprises at least one cyclic pro-perfume as described herein. Preferably said fragrance delivery system delivers at least one tertiary fragrance raw material alcohol. These and other objects, features and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims.
  • All percentages, ratios and proportions herein are by weight, unless otherwise specified. All temperatures are in degrees Celsius (° C) unless otherwise specified. All documents cited are in relevant part, incorporated herein by reference.
    • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention relates to cyclic pro-perfumes capable of releasing at least one fragrance raw material alcohol. Surprisingly, the cyclic pro-perfumes of the present invention are capable of releasing in a controlled manner desirable tertiary perfume raw material alcohols inter alia linalool, ethyllinalool, dihydromyrcenol, and tetrahydrolinalool.
  • The pro-perfumes of the present invention are essentially orthoesters. Orthoesters, in general, may be considered to be "acetals" of carboxylic acid esters which can be formed by the reaction of an ester with two equivalents of alcohol. Treatment of orthoesters with sufficient acid catalyst in the presence of moisture results in the "reversion" of orthoesters back into a mixture of ester and alcohol. In the instance where the ester alcohol is not the same as the orthoester forming alcohol, and depending upon the structure and reactivity of the orthoester components, one of the alcohols released from the reversion reaction may be the original ester alcohol resulting in one of the "orthoester forming" alcohols now comprising the ester. In this instance, "transesterification" has occurred.
  • Without wishing to be limited by theory, the release rate of the fragrance raw material alcohol from the cyclic orthoesters of the present invention may be controlled, for example, by adjusting, separately or in combination, either the relative basicity of the orthoester oxygen atoms in the cyclic moiety or the torsional ring strain of the resulting cyclic orthoesters. One result of these adjustments is to provide increased or decreased ring opening kinetics and thereby a means for regulating the release rate of the fragrance raw material alcohol.
    • Cyclic Pro-perfumes
  • The cyclic pro-perfumes of the present invention have the formula:
    Figure 00050001
    wherein the moiety -OR is derived from a fragrance raw material alcohol having the general formula ROH. Fragrance raw material alcohols which can be suitably released by the cyclic pro-perfumes of the present invention are 2,4-dimethyl-3-cyclohexene-1-methanol (Floralol), 2,4-dimethyl cyclohexane methanol (Dihydro floralol), 5,6-dimethyl-1-methylethenylbicyclo-[2.2.1]hept-5-ene-2-methanol (Arbozol), 2,4,6-trimethyl-3-cyclohexene-1-methanol (Isocyclo geraniol), 4-(1-methylethyl)cyclohexanemethanol (Mayol), α-3,3-trimethyl-2-norborane. methanol, 1,1-dimethyl-1-(4-methylcyclohex-3-enyl)methanol, 2-phenylethanol, 2-cyclohexyl ethanol, 2-(o-methylphenyl)-ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)ethanol, 6,6-dimethylbicyclo-[3.1.1]hept-2-ene-2-ethanol (nopol), 2-(4-methylphenoxy)ethanol, 3,3-dimethyl-Δ2-β-norbornane ethanol, 2-methyl-2-cyclohexylethanol, 1-(4-isopropylcyclohexyl)-ethanol, 1-phenylethanol, 1,1-dimethyl-2-phenylethanol, 1,1-dimethyl-2-(4-methyl-phenyl)ethanol, 1-phenylpropanol, 3-phenylpropanol, 2-phenylpropanol (Hydrotropic Alcohol), 2-(cyclododecyl)propan-1-ol (Hydroxy-ambran), 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol (Majantol), 2-methyl-3-phenylpropanol, 3-phenyl-2-propen-1-ol (cinnamyl alcohol), 2-methyl-3-phenyl-2-propen-1-ol (methylcinnamyl alcohol), a-n-pentyl-3-phenyl-2-propen-1-ol (α-amyl-cinnamyl alcohol), ethyl-3-hydroxy-3-phenyl propionate, 2-(4-methylphenyl)-2-propanol, 3-(4-methylcyclohex-3-ene)butanol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)butanol, 2-ethyl-4-(2,2,3-trimethyl-cyclopent-3-enyl)-2-buten-1-ol, 3-methyl-2-buten-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten- 1-yl)-2-buten-1-ol, 3-hydroxy-2-butanone, ethyl 3-hydroxybutyrate, 4-phenyl-3-buten-2-ol, 2-methyl-4-phenylbutan-2-ol, 4-(4-hydroxyphenyl)butan-2-one, 4-(4-hydroxy-3-methoxyphenyl)butan-2-one, 3-methyl-pentanol, 3-methyl-3-penten-1-ol, 2-methyl-4-phenylpentanol (Pamplefleur), 3-methyl-5-phenylpentanol (Phenoxanol), 2-methyl-5-phenylpentanol, 2-methyl-5-(2,3-dimethyltricyclo[2.2.1.0(2,6)]hept-3-yl)-2-penten-1-ol (santalol), 4-methyl-1-phenyl-2-pentanol, (1-methyl-bicyclo[2.1.1]hepten-2-yl)-2-methylpent-1-en-3-ol, 3-methyl-1-phenylpentan-3-ol, 1,2-dimethyl-3-(1-methylethenyl)cyclopentan-1-ol, 2-isopropyl-5-methyl-2-hexenol, cis-3-hexen-1-ol, trans-2-hexen-1-ol, 2-isoproenyl-4-methyl-4-hexen-1-ol (Lavandulol), 2-ethyl-2-prenyl-3-hexenol, 1-hydroxymethyl-4-iso-propenyl-1-cyclohexene (Dihydrocuminyl alcohol), 1-methyl-4-isopropenylcyclohex-6-en-2-ol (carvenol), 6-methyl-3-isopropenylcyclohexan-1-ol, 1-methyl-4-iso-propenylcyclohexan-3-ol, 4-isopropyl-1-methylcydohexan-3-ol, 4-tert-butylcyclo-hexanol, 2-tert-butylcyclohexanol, 2-tert-butyl-4-methylcyclohexanol, 4-isopropyl-cyclohexanol, 4-methyl-1-(1-methylethyl)-3-cyclohexen-1-ol, 2-(5,6,6-trimethyl-2-norbornyl)cyclohexanol, isobornylcyclohexanol, 3,3,5-trimethylcyclohexanol, 1-methyl-4-isopropylcyclohexan-3-ol, 1,2-dimethyl-3-(1-methylethyl)cyclohexan-1-ol, heptanol, 2,4-dimethylheptan-1-ol, 2,4-dimethyl-2,6-heptandienol, 6,6-dimethyl-2-oxymethylbicyclo[3.1.1]hept-2-ene (myrtenol), 4-methyl-2,4-heptadien-1-ol, 3,4,5,6,6-pentamethyl-2-heptanol, 3,6-dimethyl-3-vinyl-5-hepten-2-ol, 6,6-dimethy-3-hydroxy-2-methylenebicyclo[3.1.1]heptane, 1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol, 2,6-dimethylheptan-2-ol, 2,6,6-trimethylbicyclo[1.3.3]heptan-2-ol, octanol, 2-octenol, 2-methyloctan-2-ol, 2-methyl-6-methylene-7-octen-2-ol (myrcenol), 7-methyloctan-1-ol, 3,7-dimethyl-6-octenol, 3,7-dimethyl-7-octenol, 3,7-dimethyl-6-octen-1-ol (citronellol), 3,7-dimethyl-2,6-octadien-1-ol (geraniol), 3,7-dimethyl-2,6-octadien-1-ol (nerol), 3,7-dimethyl-1,6-octadien-3-ol (linalool), 3,7-dimethyloctan-1-ol (pelagrol), 3,7-dimethyloctan-3-ol (tetrahydrolinalool), 2,4-octadien-1-ol, 3,7-dimethyl-6-octen-3-ol, 2,6-dimethyl-7-octen-2-ol (dihydromyrcenol), 2,6-dimethyl-5,7-octadien-2-ol, 4,7-dimethyl-4-vinyl-6-octen-3-ol, 3-methyloctan-3-ol, 2,6-dimethyloctan-2-ol, 2,6-dimethyloctan-3-ol, 3,6-dimethyloctan-3-ol, 2,6-dimethyl-7-octen-2-ol, 2,6-dimethyl-3,5-octadien-2-ol (muguol), 3-methyl-1-octen-3-ol, 7-hydroxy-3,7-dimethyloctanal, 3-nonanol, 2,6-nonadien-1-ol, cis-6-nonen-1-ol, 6,8-dimethylnonan-2-ol, 3-(hydroxymethyl)-2-nonanone, 2-nonen-1-ol, 2,4-nonadien-1-ol, 3,7-dimethyl-1,6-nonadien-3-ol (ethyllinalool), decanol, 9-decenol, 2-benzyl-M-dioxa-5-ol, 2-decen-1-ol, 2,4-decadien-1-ol, 4-methyl-3-decen-5-ol, 3,7,9-trimethyl-1,6-decadien-3-ol (isobutyl linallol), undecanol, 2-undecen-1-ol, 10-undecen-1-ol, 2-dodecen-1-ol, 2,4-dodecadien-1-ol, 2,7,11-trimethyl-2,6,10-dodecatrien-1-ol (farnesol), 3,7,11-trimethyl-1,6,10,-dodecatrien-3-ol, 3,7,11,15-tetramethylhexadec-2-en-1-ol (phytol), 3,7,11,15-tetramethylhexadec1-en-3-ol (iso phytol), benzyl alcohol, p-methoxy benzyl alcohol (anisyl alcohol), para-cymen-7-ol (cuminyl alcohol), 4-methyl benzyl alcohol, 3,4-methylenedioxy benzyl alcohol, methyl salicylate, benzyl salicylate, cis-3-hexenyl salicylate, n-pentyl salicylate, 2-phenylethyl salicylate, n-hexyl salicylate, 2-methyl-5-isopropylphenol, 4-ethyl-2-methoxyphenol, 4-allyl-2-methoxyphenol (eugenol), 2-methoxy-4-(1-propenyl)phenol (isoeugenol), 4-allyl-2,6-dimethoxy-phenol, 4-tert-butylphenol, 2-ethoxy-4-methylphenol, 2-methyl-4-vinylphenol, 2-isopropyl-5-methylphenol (thymol), pentyl-ortho-hydroxy benzoate, ethyl 2-hydroxy-benzoate, methyl 2,4-dihydroxy-3,6-dimethylbenzoate, 3-hydroxy-5-methoxy-1-methylbenzene, 2-tert-butyl-4-methyl-1-hydroxybenzene, 1-ethoxy-2-hydroxy-4-propenylbenzene, 4-hydrozytoluene, 4-hydroxy-3-methoxybenzaldehyde, 2-ethoxy-4-hydroxybenzaldehyde, decahydro-2-naphthol, 2,5,5-trimethyl-octahydro-2-naphthol, 1,3,3-trimethyl-2-norbomanol (fenchol), 3a,4,5,6,7,7a-hexahydro-2,4-dimethyl-4,7-methano-1H-inden-5-ol, 3a,4,5,6,7,7a-hexahydro-3,4-dimethyl-4,7-methano-1H-inden-5-ol, 2-methyl-2-vinyl-5-(1-hydroxy-1-methylethyl)tetrahydrofuran, β-caryophyllene alcohol, and mixtures thereof.
  • Preferred fragrance raw material alcohols are tertiary alcohols inter alia 3,7-dimethyl-1,6-octadien-3-ol (linalool), 3,7-dimethyloctan-3-ol (tetrahydrolinalool), 3,7-dimethyl-1,6-nonadien-3-ol (ethyllinalool), and 2,6-dimethyl-7-octen-2-ol (dihydromyrcenol).
  • R1 is hydrogen, C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, alkylenearyl, and substituted or unsubstituted alkyleneoxyalkyl. Preferably R1 is hydrogen, C1-C4 alkyl, alkylenearyl; more preferably hydrogen, methyl, ethyl, propyl, iso-propyl, t-butyl, phenyl, substituted phenyl, benzyl and substituted benzyl.
  • R2, R3, R4, and R5 are each independently hydrogen, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, and substituted or unsubstituted alkyleneoxyaryl, and mixtures thereof. In addition, any two R2, R3, R4, or R5 units can be taken together to form a fused ring cyclic pro-perfume having from 3 to 8 carbon atoms and optionally one or more heteroatoms in the ring. An example of a fused ring cyclic pro-perfume includes the general formulae:
    Figure 00090001
    The fused rings may also optionally comprise one or more heteroatoms, preferably oxygen, nitrogen, sulfur and mixtures thereof. An example of a fused ring cyclic pro-perfume comprising a heteroatom has the formula:
    Figure 00090002
    wherein R8 is independently hydrogen, C1-C22 alkyl, hydrogen, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, substituted or unsubstituted alkyleneoxyaryl, or one or more saccharide units. Non-limiting examples of saccharide units according to the present invention include erythrose, threose, arabinose, ribose, lysose, xylose, glucose, mannose, allose, altrose, talose, galactose, idose, gulose, fructose, and combinations thereof. The saccharides of the present invention are preferably in the pyranose (closed ring) form, however, when in solution, an equilibrium may exist wherein some of the material may exist in the non-preferred ring opened form. Any number of saccharides can be linked together. For example, oligosaccharide - two or three saccharides or polysaccharides - more than three saccharides, are suitable for use in the present invention.
  • The cyclic pro-perfumes of the present invention further comprise spiroannulated rings having from 3 to 8 carbon atoms and optionally one or more heteroatoms in the ring, examples of which have the general formulae:
    Figure 00100001
    wherein said fused ring or spiroannulated ring cyclic pro-perfumes may have their rings further substituted by one or more units, said units are independently hydroxyl, C1-C22 alkoxy, C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, and alkylenearyl units. The fused rings may also comprise one or more aromatic rings, including heteroaromatic rings. Examples of aromatic and heteroaromatic rings include benzene, naphthalene, pyridine, quinoline, isoquinoline, etc.
  • Preferably R2, R3, R4, and R5 are selected such that said units comprise a vicinal diol or 1,3-type diol. For example, when taken together, R2, R3, R4, and R5 derive from diols non-limiting examples of which, include 1,2- propanediol, 1,2-butanediol, 1,2-hexanediol, 1,2-octanediol, 1,3-hydroxyacetone, 1,3-octanediol. All of the preceding examples of diols include a hydroxy moiety at the terminus or the alkyl chain. However, as described herein below, non-terminal hydroxy diols are also preferred.
  • Spacing unit Y is -CR6R7-, C=O, and mixtures thereof. R6 and R7 are independently hydrogen (wherein the moiety -CR6R7- is a methylene unit), hydroxyl, nitro, nitrilo, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, and substituted or unsubstituted alkyleneoxyaryl, or R6 and R7 as described herein above can be taken together to form a spiroannulated ring or taken together with any R2, R3, R4, or R5 unit to form a fused ring, said spiroannulated or fused ring having from 3 to 8 carbons. In addition, the resulting spiroannulated or fused rings may be further substituted by one or more C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, and alkylenearyl units.
  • The index n is an integer from 0 to 3, preferably 0 or 1, more preferably 0.
  • For the purposes of the present invention substituted or unsubstituted alkyleneoxy units are defined as moieties having the formula:
    Figure 00110001
    wherein R5 is hydrogen; R6 is hydrogen, methyl, ethyl, and mixtures thereof; the index x is from 1 to about 20.
  • For the purposes of the present invention substituted or unsubstituted alkyleneoxyalkyl are defined as moieties having the formula:
    Figure 00110002
    wherein R5 is hydrogen, C1-C18 alkyl, C1-C4 alkoxy, and mixtures thereof; R6 is hydrogen, methyl, ethyl, and mixtures thereof; the index x is from 1 to about 20 and the index y is from 2 to about 30.
  • For the purposes of the present invention substituted or unsubstituted alkylenearyl units are defined as moieties having the formula:
    Figure 00110003
    wherein R5 and R6 are each independently hydrogen, hydroxy, C1-C4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H; -CO2R'; -CONH2; -CONHR'; -CONR'2;
    wherein R' is C1-C12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, p is from 1 to about 34.
  • For the purposes of the present invention substituted or unsubstituted aryloxy units are defined as moieties having the formula:
    Figure 00120001
    wherein R5 and R6 are each independently hydrogen, hydroxy, C1-C4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H, -CO2R'; -CONH2; -CONHR'; -CONR'2; wherein R' is C1-C12 linear or branched alkyl), amino, alkylamino, and mixtures thereof.
  • For the purposes of the present invention substituted or unsubstituted alkyleneoxyaryl units are defined as moieties having the formula:
    Figure 00120002
    wherein R5 and R6 are each independent ly hydrogen, hydroxy, C1-C4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H, -CO2R'; -CONH2; -CONHR'; -CONR'2; wherein R' is C1-C12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, q is from 1 to about 34.
  • For the purposes of the present invention substituted or unsubstituted oxyalkylenearyl units are defined as moieties having the formula:
    Figure 00120003
    wherein R5 and R6 are each independently hydrogen, hydroxy, C1-C4 alkoxy, nitrilo, halogen, nitro, carboxyl (-CHO, -CO2H, -CO2R'; -CONH2; -CONHR'; -CONR'2; wherein R' is C1-C12 linear or branched alkyl), amino, alkylamino, and mixtures thereof, w is from 1 to about 34.
  • Not wishing to be limited by theory, a formulator wishing to increase the degree of torsional strain in the pro-perfume ring may, however, select a diol having two non-terminus alcohols, for example, 2,3-octanediol or 3,4-octandiol. The increase or decrease in the torsional strain of the cyclic pro-perfume ring provides the formulator with a means for adjusting the rate at which the fragrance raw material alcohol is released by the cyclic orthoester. For example, the two cyclic pro-perfumes having the formulae:
    Figure 00130001
    will exhibit different release rates of perfume raw material alcohol ROH due in part to the torsional strain provided by the eclipsing interaction of the methyl group with the alkyl chain.
    • Fragrance Delivery System
  • The present invention further relates to fragrance delivery systems comprising:
  • a) at least one cyclic pro-perfume;
  • b) optionally one or more pro-perfumes, pro-fragrances, or pro-accords capable of releasing one or more fragrance raw materials, said fragrance raw materials selected from the group consisting of aldehydes, ketones, alcohols, esters, nitrites, nitro compounds, linear, branched and cyclic alkenes, ethers, and mixtures thereof;
  • c) optionally one or more fragrance raw materials; and
  • d) the balance carriers and adjunct ingredients.
  • The pro-perfumes, pro-fragrances, or pro-accords which are combinable with the cyclic pro-perfumes of the present invention are preferably the pro-accords. The term "accord" as used herein is defined as "a mixture of two or more 'fragrance raw materials' which are artfully combined to impart a pleasurable scent, odor, essence, or fragrance characteristic". Therefore a material which is a "pro-accord" is capable of releasing a mixture of fragrance raw materials or a fragrance accord. Non-limiting examples of pro-accords and pro-fragrances include orthoesters, acetals, ketals, orthocarbonates, and the like described herein below.
  • When formulated into a fragrance delivery system, the cyclic pro-perfumes of the present invention will comprise from about 0.1% to about 99%, preferably from about 1% to about 50% by weight, of said fragrance delivery system.
  • The fragrance delivery systems of the present invention preferably comprise the pro-accords described herein below. When present, said pro-accords comprise singly or as an admixture from 0.1% to about 99%, preferably from about 1% to about 50% by weight of the fragrance delivery system.
  • In addition, the fragrance delivery systems of the present invention further comprises carriers, fixatives, and other adjunct ingredients which can be added in any suitable amount or ratio to the cyclic pro-perfumes or the optional pro-accords which comprise the balance of the delivery system. Typical carriers are methanol, ethanol (preferred), iso-propanol, polyethylene glycol, as well as water in some instances. Fixatives serve to lower the volatility of certain top and middle notes in order to extend their contact time on skin. Adjunct ingredients include perfume raw material components which are essential oils and are therefore not a single chemical entity. In addition, the adjunct ingredients may be mixtures of synthetic fragrance raw materials which serve a further purpose in addition to providing a pleasurable odor.
    • Orthoesters
  • One class of preferred compounds useful as pro-accords according to the present invention are orthoesters having the formula:
    Figure 00140001
    wherein hydrolysis of the orthoester releases fragrance raw material components according to the following scheme:
    Figure 00150001
    wherein R is hydrogen, C1-C8 linear alkyl, C4-C20 branched alkyl, C6-C20 cyclic alkyl, C6-C20 branched cyclic alkyl, C6-C20 linear alkenyl, C6-C20 branched alkenyl, C6-C20 cyclic alkenyl, C6-C20 branched cyclic alkenyl, C6-C20 substituted or unsubstituted aryl, preferably the moieties which substitute the aryl units are alkyl moieties, preferably R is hydrogen, methyl, ethyl, and phenyl. R1, R2 and R3 are independently C1-C20 linear, branched, or substituted alkyl; C2-C20 linear, branched, or substituted alkenyl; C5-C20 substituted or unsubstituted cyclic alkyl; C6-C20 substituted or unsubstituted aryl, C2-C40 substituted or unsubstituted alkyleneoxy; C3-C40 substituted or unsubstituted alkyleneoxyalkyl; C6-C40 substituted or unsubstituted alkylenearyl; C6-C32 substituted or unsubstituted aryloxy, C6-C40 substituted or unsubstituted alkyleneoxyaryl; and C6-C40 oxyalkylenearyl. By the term "substituted" herein is meant "compatible moieties which replace a hydrogen atom". Non-limiting examples of substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H; -CO2R'; -CONH2; -CONHR'; -CONR'2; wherein R1 is C1-C12 linear or branched alkyl), amino, and C1-C12 mono- and dialkylamino.
    • Acetals and ketals
  • Another class of compound useful as pro-accords according to the present invention are acetals and ketals having the formula:
    Figure 00150002
    wherein hydrolysis of the acetal or ketal releases one equivalent of aldehyde or ketone and two equivalents of alcohol according to the following scheme:
    Figure 00150003
    wherein R is C1-C20 linear alkyl, C4-C20 branched alkyl, C6-C20 cyclic alkyl, C6-C20 branched cyclic alkyl, C6-C20 linear alkenyl, C6-C20 branched alkenyl, C6-C20 cyclic alkenyl, C6-C20 branched cyclic alkenyl, C6-C20 substituted or unsubstituted aryl, preferably the moieties which substitute the aryl units are alkyl moieties. R1 is hydrogen, R, or in the case wherein the pro-accord is a ketal, R and R1 can be taken together to form a ring. R2 and R3 are independently selected from the group consisting of C5-C20 linear, branched, or substituted alkyl; C4-C20 linear, branched, or substituted alkenyl; C5-C20 substituted or unsubstituted cyclic alkyl; C6-C20 substituted or unsubstituted aryl, C2-C40 substituted or unsubstituted alkyleneoxy; C3-C40 substituted or unsubstituted alkyleneoxyalkyl; C6-C40 substituted or unsubstituted alkylenearyl; C6-C32 substituted or unsubstituted aryloxy; C6-C40 substituted or unsubstituted alkyleneoxyaryl; and C6-C40 oxyalkyleneary. By the term "substituted" herein is meant "compatible moieties which replace a hydrogen atom". Non-limiting examples of substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H; -CO2R';-CONH2; -CONHR'; -CONR'2; wherein R' is C1-C12 linear or branched alkyl), amino, and C1-C12 mono- and dialkylamino.
    • Orthocarbonates
  • Another class of preferred compounds useful as pro-accords according to the present invention are orthocarbonates having the formula:
    Figure 00160001
    wherein hydrolysis of the orthoester releases the fragrance raw material components according to the following scheme:
    Figure 00160002
    which can continue to hydrolyze and further release two equivalents of one or more fragrance raw material alcohol according to the following scheme:
    Figure 00170001
    thereby providing up to four equivalents of fragrance raw material alcohol per equivalent of delivered orthocarbonate, wherein R1, R2, R3, and R4 are independently C1-C20 linear, branched, or substituted alkyl; C2-C20 linear, branched, or substituted alkenyl; C5-C20 substituted or unsubstituted cyclic alkyl; C6-C20 substituted or unsubstituted aryl, C2-C40 substituted or unsubstituted alkyleneoxy; C3-C40 substituted or unsubstituted alkyleneoxyalkyl; C6-C40 substituted or unsubstituted alkylenearyl; C6-C32 substituted or unsubstituted aryloxy; C6-C40 substituted or unsubstituted alkyleneoxyaryl; and C6-C40 oxyalkylenearyl. By the term "substituted" herein is meant "compatible moieties which replace a hydrogen atom". Non-limiting examples of substituents are hydroxy, nitrilo, halogen, nitro, carboxyl (-CHO; -CO2H; -CO2R'; -CONH2; -CONHR'; -CONR'2; wherein R' is C1-C12 linear or branched alkyl), amino, and C1-C12 mono- and dialkylamino.
    • Fragrance Release Half-life
  • The cyclic pro-perfumes and other pro-accords useful in the fragrance delivery systems of the present invention generally have a delayed release of final fragrance accord in order to achieve the increased fragrance longevity benefits described herein. However, the pro-accords generally also deliver the fragrance accords during a time period useful to the formulator, for example, within a time period desirable to the consumer.
  • For the purposes of the present invention the pro-accords generally have a "Fragrance Release Half-life" of less than or equal to 12 hours when measured in NaH2PO4 buffer at pH 2.5 and greater than or equal to 0.1 hour when measured in NaH2PO4 buffer at pH 5.3. The "Fragrance Release Half-life" is defined herein as follows.
  • Pro-accords deliver their corresponding mixture of fragrance raw materials or fragrance accords according to the equation: Pro-Accord → Accord wherein the accord which is released may be a binary accord or a multiple fragrance raw material accord.
  • The rate at which the accord is released is defined by the formula: Rate = k[Pro-accord] and can be further expressed by the formula: - d[Pro-accord] dt = k[Pro-accord] wherein k is the release rate constant and [Pro-accord] is the concentration of pro-accord. For the purposes of the present invention the "Fragrance Release Half-life", t1/2, is related to the release rate constant by the formula: t1/2 = 0.693k and this relationship is used for the purposes of the present invention to determine the "fragrance Release Half-life" (FRHL).
  • Due to the hydrophobic nature of some pro-accords, it is necessary to conduct the determination of t1/2 and k in a mixture of 90/10 dioxane/phosphate buffered water.
    An example of the procedure used to measure the suitability of a pro-accord for use in the fragrance delivery systems at pH 2.5 is as follows. The phosphate buffered water is prepared by admixing 3.95 mL of 85% phosphoric acid (H3PO4) and 24 g of sodium dihydrogen phosphate (NaH2PO4) with one liter of water. The pH of this solution is approximately 2.5. Next 10 mL of the phosphate buffer is admixed with 90 mL of dioxane and the pro-fragrance to be analyzed is added. The hydrolysis kinetics are then monitored by conventional HPLC at 30° C.
  • The pro-accord component of the present invention, in order to assure the stability of acid labile pro-accords, may include a source of reserve alkalinity equivalent to at least 0.001 molar (1 milli-molar) sodium hydroxide. This reserve alkalinity generally serves to prevent premature release of the fragrance raw materials by the pro-accords prior to exposure of the pro-accords to skin. For the purposes of the present invention the term "a reserve alkalinity of at least 0.001 molar" is defined as "the amount of alkaline material present in one liter of the second component when placed in an equivalent volume of water, would produce a hydroxide ion equivalent of 0.001 moles or greater". By way of illustration, 0.0004 g of NaOH present in a 10 mL aliquot of the second component would produce a reserve alkalinity of at least 0.001 molar.
  • Suitable sources of alkalinity are the alkali metal and alkali earth hydroxides. For example, sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, and sodium silicate. However, other suitable sources of alkalinity can be used which are compatible with the pro-accords of the "pro-accord component".
  • In addition, the fragrance delivery system of the present invention may be suitably use in a fine fragrance composition. Said perfume compositions provide extended fragrance character impressions, and comprise:
  • A) a pro-accord component comprising:
  • i) from 0.1% to 99% by weight, of one or more pro-accords formed from at least one fragrance raw material, said pro-accord releasing upon hydrolysis at least two fragrance raw materials selected from the group consisting of primary, secondary, and tertiary alcohols, aldehydes, ketones, esters, carbonates, and mixtures thereof, provided each pro-accord:
  • a) is formed from at least one fragrance raw material having a molecular weight greater than or equal to about 100 g/mol;
  • b) has a molecular weight greater than or equal to about 300 g/mol;
  • c) has a molecular weight at least two times greater than the lowest molecular weight fragrance raw material which comprises said pro-accord;
  • d) has a fragrance release half-life of less than or equal to about 12 hours at pH 2.5 or greater than or equal to about 0.1 hour at pH 5.3 when measured in NaH2PO4 buffer;
  • ii) the balance carriers, stabilizers, and other adjunct ingredients whereby said pro-accord component is provided with an amount of reserve alkalinity equal to at least 0.001 molar NaOH;
  • B) a fragrance raw material component comprising:
  • i) from 0.1% to about 99% by weight, of a mixture of base note fragrances;
  • ii) from 0.1% to about 99% by weight, of one or more top and middle note fragrances;
  • ii) the balance carriers, fixatives, and other adjunct ingredients; and
  • C) from 0.1% to about 99% by weight, of a cyclic pro-perfume component comprising one or more of the cyclic pro-perfumes described herein.
  • The following are examples of cyclic pro-accords of the present invention which release fragrance raw materials.
    • EXAMPLE 1 3,4,6-tri- O -acetyl-1,2-(ethyllinalyl)orthoacetyl-α-D-glucopyranose
  • Acetobromoglucose, tetrabutylammonium bromide (0.3 equiv), and ethyllinalool (3 equiv) are suspended in dry collidine and stirred at 65 °C for 3 days. The reaction mixture is diluted with 2 volumes of ether, washed twice with water, and then dried (MgSO4), evaporated, and purified by flash chromatography.
    • EXAMPLE 2 1,2-(ethyllinalyl)orthoacetyl-α-D-glucopyranose
  • A solution of 3,4,b-tri-O-acetyl-1,2-(ethyllinalyl)orthoacetyl-α-D-glucopyranose in ethanol is treated with anhydrous Na2CO3 (0.25 equiv.) and stirred for 6-12 h. After filtration and evaporation of solvent, the resulting material is purified by flash chromatography.
  • The cyclic pro-perfumes of the present invention are also suitable for use in personal care and personal hygiene compositions. The following are examples of a personnel cleanser composition which is prepared by combining the following ingredients using conventional mixing techniques.
    Weight %
    Ingredients 3 4 5 6
    Phase A
    Water QS 100 QS 100 QS 100 QS 100
    Disodium EDTA 0.100 0.100 0.100 0.100
    Glycerin 4.00 4.00 4.00 4.00
    Methylparaben 0.200 0.200 0.200 0.200
    C10-C30 alkyl acrylate crosspolymer 0.150 0.150 0.150 0.150
    Carbomer 954 0.250 0.250 0.250 0.250
    Phase B
    Stearic Acid 0.110 0.110 0.110 0.110
    Stearyl alcohol 0.875 0.875 0.875 0.875
    Cetyl alcohol 0.875 0.875 0.875 0.875
    Propylparaben 0.150 0.150 0.150 0.150
    Steareth-2 -- 0.25 0.25 0.25
    Steareth-21 -- 0.50 0.50 0.50
    Phase C
    Sodium hydroxide 0.130 0.130 0.130 0.130
    Phase D
    Diisopropyl sebacate 1.50 1.50 1.50 1.50
    Isohexadecane 5.00 2.00 5.00 5.00
    Mineral Oil -- 5.00 -- --
    Phase E
    Phenoxyethanol 0.5 0.5 -- 0.5
    Pro-accord 1.5 1.5 2.20 1.5
    Phase F
    Glucose amide 0.96 0.96 0.96 0.96
  • The above Examples 3-6 can be suitably prepared as follows. In a suitable vessel, the Phase A ingredients are mixed at room temperature to form a dispersion and heated with stirring to 70-80° C. In a separate vessel, the Phase B ingredients are heated with stirring to 70-80° C. Phase B is then added to Phase A with mixing to form the emulsion. Next, Phase C is added to neutralize the composition. The Phase D ingredients are added with mixing, followed by cooling to 45-50° C. The Phase E ingredients are then added with stirring, followed by cooling to 40° C. Phase F is heated with mixing to 40° C and added to the emulsion, which is cooled to room temperature. The resulting cleansing composition is useful for cleansing the skin. The emulsion de-emulsifies upon contact with the skin.

Claims (10)

  1. A pro-perfume capable of releasing at least one fragrance raw material alcohol having the formula:
    Figure 00230001
    wherein -OR is a unit derived from a fragrance raw material alcohol; selected from 2,4-dimethyl cyclohexane methanol (Dihydro floralol), 5,6-dimethyl-1-methylethenylbicyclo-[2.2.1]hept-5-ene-2-methanol (Arbozol), 2,4,6-trimethyl-3-cyclohexene-1-methanol (Isocyclo geraniol), 4-(1-methylethyl)cyclohexanemethanol (Mayol), α-3,3-trimethyl-2-norborane methanol, 1,1-dimethyl-1-(4-methylcyclohex-3-enyl)methanol, 2-phenylethanol, 2-cyclohexyl ethanol, 2-(o-methylphenyl)-ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)ethanol, 6,6-dimethylbicyclo[3.1.1]hept-2-ene-2-ethanol (nopol), 2-(4-methylphenoxy)ethanol, 3,3-dimethyl-Δ2-β-norbornane ethanol, 2-methyl-2-cyclohexylethanol, 1-(4-isopropylcyclohexyl)-ethanol, 1-phenylethanol, 1,1-dimethyl-2-phenylethanol, 1,1-dimethyl-2-(4-methyl-phenyl)ethanol, 1-phenylpropanol, 3-phenylpropanol, 2-phenylpropanol (Hydrotropic Alcohol), 2-(cyclododecyl)propan-1-ol (Hydroxy-ambran), 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol (Majantol), 2-methyl-3-phenylpropanol, 3-phenyl-2-propen-1-ol (cinnamyl alcohol), 2-methyl-3-phenyl-2-propen-1-ol (methylcinnamyl alcohol), a-n-pentyl-3-phenyl-2-propen-1-ol (α-amylcinnamyl alcohol), ethyl-3-hydroxy-3-phenyl propionate, 2-(4-methylphenyl)-2-propanol, 3-(4-methylcyclohex-3-ene)butanol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)butanol, 2-ethyl-4-(2,2,3-trimethylcyclopent-3-enyl)-2-buten-1-ol, 3-methyl-2-buten-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-hydroxy-2-butanone, ethyl 3-hydroxybutyrate, 4-phenyl-3-buten-2-ol, 2-methyl-4-phenylbutan-2-ol, 4-(4-hydroxyphenyl)butan-2-one, 4-(4-hydroxy-3-methoxyphenyl)butan-2-one, 3-methyl-pentanol, 3-methyl-3-penten-1-ol, 2-methyl-4-phenylpentanol (Pamplefleur), 3-methyl-5-phenylpentanol (Phenoxanol), 2-methyl-5-phenylpentanol, 2-methyl-5-(2,3-dimethyltricyclo[2.2.1.0(2,6)]hept-3-yl)-2-penten-1-ol (santalol), 4-methyl-1-phenyl-2-pentanol, (1-methylbicyclo[2.1.1]hepten-2-yl)-2-methylpent-1-en-3-ol, 3-methyl-1-phenylpentan-3-ol, 1,2-dimethyl-3-(1-methylethenyl)cyclopentan-1-ol, 2-isopropyl-5-methyl-2-hexenol, cis-3-hexen-1-ol, trans-2-hexen-1-ol, 2-isoproenyl-4-methyl-4-hexen-1-ol (Lavandulol), 2-ethyl-2-prenyl-3-hexenol, 1-hydroxymethyl-4-iso-propenyl- 1-cyclohexene (Dihydrocuminyl alcohol), 1-methyl-4-isopropenylcyclohex-6-en-2-ol (carvenol), 6-methyl-3-isopropenylcyclohexan-1-ol, 1-methyl-4-iso-propenylcyclohexan-3-ol, 4-isopropyl-1-methylcyclohexan-3-ol, 4-tert-butylcyclo-hexanol, 2-tert-butylcyclohexanol, 2-tert-butyl-4-methylcyclohexanol, 4-isopropyl-cyclohexanol, 4-methyl-1-(1-methylethyl)-3-cyclohexen-1-ol, 2-(5,6,6-trimethyl-2-norbornyl)cyclohexanol, isobomylcyclohexanol, 3,3,5-trimethylcyclohexanol, 1-methyl-4-isopropylcyclohexan-3-ol, 1,2-dimethyl-3-(1-methylethyl)cyclohexan-1-ol, heptanol, 2,4-dimethylheptan-1-ol, 2,4-dimethyl-2,6-heptandienol, 6,6-dimethyl-2-oxymethylbicyclo[3.1.1]hept-2-ene (myrtenol), 4-methyl-2,4-heptadien-1-ol, 3,4,5,6,6-pentamethyl-2-heptanol, 3,6-dimethyl-3-vinyl-5-hepten-2-ol, 6,6-dimethy-3-hydroxy-2-methylenebicyclo[3.1.1]heptane, 1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol, 2,6-dimethylheptan-2-ol, 2,6,6-trimethylbicyclo[1.3.3]heptan-2-ol, octanol, 2-octenol, 2-methyloctan-2-ol, 2-methyl-6-methylene-7-octen-2-ol (myrcenol), 7-methyloctan-1-ol, 3,7-dimethyl-6-octenol, 3,7-dimethyl-7-octenol, 3,7-dimethyl-6-octen-1-ol (citronellol), 3,7-dimethyl-2,6-octadien-1-ol (geraniol), 3,7-dimethyl-2,6-octadien-1-ol (nerol), 3,7-dimethyl-1,6-octadien-3-ol (linalool), 3,7-dimethyloctan-1-ol (pelagrol), 3,7-dimethyloctan-3-ol (tetrahydrolinalool), 2,4-octadien-1-ol, 3,7-dimethyl-6-octen-3-ol, 2,6-dimethyl-7-octen-2-ol (dihydromyrcenol), 2,6-dimethyl-5,7-octadien-2-ol, 4,7-dimethyl-4-vinyl-6-octen-3-ol, 3-methyloctan-3-ol, 2,6-dimethyloctan-2-ol, 2,6-dimethyloctan-3-ol, 3,6-dimethyloctan-3-ol, 2,6-dimethyl-7-octen-2-ol, 2,6-dimethyl-3,5-octadien-2-ol (muguol), 3-methyl-1-octen-3-ol, 7-hydroxy-3,7-dimethyloctanal, 3-nonanol, 2,6-nonadien-1-ol, cis-6-nonen-1-ol, 6,8-dimethylnonan-2-ol, 3-(hydroxymethyl)-2-nonanone, 2-nonen-1-ol, 2,4-nonadien-1-ol, 3,7-dimethyl-1,6-nonadien-3-ol (ethyllinalool), decanol, 9-decenol, 2-benzyl-M-dioxa-5-ol, 2-decen-1-ol, 2,4-decadien-1-ol, 4-methyl-3-decen-5-ol, 3,7,9-trimethyl-1,6-decadien-3-ol (isobutyl linallol), undecanol, 2-undecen-1-ol, 10-undecen-1-ol, 2-dodecen-1-ol, 2,4-dodecadien-1-ol, 2,7,11-trimethyl-2,6,10-dodecatrien-1-ol (famesol), 3,7,11-trimethyl-1,6,10,-dodecatrien-3-ol, 3,7,11,15-tetramethylhexadec-2-en-1-ol (phytol), 3,7,11,15-tetramethylhexadecl -en-3-ol (iso phytol), benzyl alcohol, p-methoxy benzyl alcohol (anisyl alcohol), para-cymen-7-ol (cuminyl alcohol), 4-methyl benzyl alcohol, 3,4-methylenedioxy benzyl alcohol, methyl salicylate, benzyl salicylate, cis-3-hexenyl salicylate, n-pentyl salicylate, 2-phenylethyl salicylate, n-hexyl salicylate, 2-methyl-5-isopropylphenol, 4-ethyl-2-methoxyphenol, 4-allyl-2-methoxyphenol (eugenol), 2-methoxy-4-(1-propenyl)phenol (isoeugenol), 4-allyl-2,6-dimethoxy-phenol, 4-tert-butylphenol, 2-ethoxy-4-methylphenol, 2-methyl-4-vinylphenol, 2-isopropyl-5-methylphenol (thymol), pentyl-ortho-hydroxy benzoate, ethyl 2-hydroxy-benzoate, methyl 2,4-dihydroxy-3,6-dimethylbenzoate, 3-hydroxy-5-methoxy-1-methylbenzene, 2-tert-butyl-4-methyl-1-hydroxybenzene, 1-ethoxy-2-hydroxy-4-propenylbenzene, 4-hydrozytoluene, 4-hydroxy-3-methoxybenzaldehyde, 2-ethoxy-4-hydroxybenzaldehyde, decahydro-2-naphthol, 2,5,5-trimethyl-octahydro-2-naphthol, 1,3,3-trimethyl-2-norbomanol (fenchol), 3a,4,5,6,7,7a-hexahydro-2,4-dimethyl-4,7-methano-1H-inden-5-ol, 3a,4,5,6,7,7a-hexahydro-3,4-dimethyl-4,7-methano-1H-inden-5-ol, 2-methyl-2-vinyl-5-(1-hydroxy-1-methylethyl)tetrahydrofuran, β-caryophyllene alcohol; R1 is hydrogen, C1-C22 alkyl, C2-C22 alkenyl, C6-C12 aryl, alkylenearyl, and substituted or unsubstituted alkyleneoxyalkyl; R2, R3, R4, and R5 are each independently selected from hydrogen, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl and substituted or unsubstituted alkyleneoxyaryl; or any two R2, R3, R4, or R5 can be taken together to form a fused ring or spiroannulated ring having from 3 to 8 carbons and optionally one or more ring heteroatoms, said ring is optionally further substituted by one or more C1-C22 alkyl, C1-C22 alkenyl, C6-C12 aryl, and alkylenearyl units; Y is -CR6R7- or C=O, wherein R6 and R7 are independently hydrogen, hydroxyl, nitro, nitrilo, C1-C30 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted branched alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, C2-C30 substituted or unsubstituted linear alkenyl, C3-C30 substituted or unsubstituted branched alkenyl, C3-C30 substituted or unsubstituted cyclic alkenyl, C2-C30 substituted or unsubstituted linear alkynyl, C3-C30 substituted or unsubstituted branched alkynyl, substituted or unsubstituted alkylenearyl, C6-C30 substituted or unsubstituted aryl, substituted or unsubstituted alkyleneoxy, substituted or unsubstituted alkyleneoxyalkyl, and substituted or unsubstituted alkyleneoxyaryl, or R6 and R7 can be taken together to form a spiroannulated ring or taken together with any R2, R3, R4, or R5 to form a fused ring, said spiroannutated or fused ring having from 3 to 8 carbons or optionally one or more ring heteroatoms, said ring further optionally substituted by one or more C1-C22 alkyl, C2-C22 alkenyl, C6-C12 aryl, and alkylenearyl units, n is from 0 to 3, and mixtures thereof.
  2. A compound according to Claim I wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, propyl, iso-propyl, t-butyl, phenyl, substituted phenyl, benzyl, and substituted benzyl.
  3. A compound according to either Claim 1 or 2 wherein R3 and R5 are each hydrogen.
  4. A compound according to any of Claims 1-3 wherein R2 and R4 are each taken together to form a fused ring.
  5. A compound according to any of Claims 1-3 wherein R2 and R4 are each independently selected from the group consisting of hydrogen, C1-C10 substituted or unsubstituted linear alkyl, C3-C30 substituted or unsubstituted cyclic alkyl, substituted or unsubstituted alkylenearyl, and C6-C10 substituted or unsubstituted aryl.
  6. A fragrance delivery system comprising:
    a) at least one cyclic pro-perfume according to Claim 1
    b) optionally one or more pro-perfumes, pro-fragrances, or pro-accords capable of releasing one or more fragrance raw materials, said fragrance raw materials selected from the group consisting of aldehydes, ketones, alcohols, esters, nitriles, nitro compounds, linear, branched and cyclic alkenes, ethers, and mixtures thereof;
    c) optionally one or more fragrance raw materials; and
    d) the balance carriers and adjunct ingredients.
  7. A composition according to Claim 6 wherein said cyclic pro-perfume in (a) releases a tertiary alcohol selected from the group consisting of linalool, ethyllinalool, tetrahydrolinalool, dihydromyrcenol, and mixtures thereof.
  8. A composition according to either Claim 6 or 7 wherein said pro-perfumes, pro-fragrances, or pro-accords in (b) are selected from the group consisting of
    a) orthoesters having the formula:
    Figure 00280001
    b) acetals having the formula:
    Figure 00280002
    c) ketals having the formula:
    Figure 00280003
    d) orthocarbonates having the formula:
    Figure 00280004
    and
    e) mixtures thereof;
    wherein R is C1-C20 linear alkyl, C3-C20 branched alkyl, C6-C20 cyclic alkyl, C4-C20 branched cyclic alkyl, C2-C20 linear alkenyl, C3-C20 branched alkenyl, C3-C20 cyclic alkenyl, C4-C20 branched cyclic alkenyl, and C6-C20 substituted or unsubstituted aryl; R1 is hydrogen or R; R2, R3, and R4 are each independently selected from the group consisting of C5-C20 linear alkyl, C4-C20 branched alkyl, C6-C20 cyclic alkyl, C6-C20 branched cyclic alkyl, C6-C20 linear alkenyl, C6-C20 branched alkenyl, C6-C20 cyclic alkenyl, C6-C20 branched cyclic alkenyl, C6-C20 aryl and C7-C20 substituted aryl.
  9. A composition according to any of Claims 6-8 wherein at least one cyclic pro-perfume of (a) or at least one pro-perfume, pro-fragrance, or pro-accord of (b) has a fragrance release half-life when measured in NaH2PO4 buffer of less than or equal to 12 hours at pH 2.5 and greater than or equal to 0.1 hours at pH 5.3.
  10. A perfume composition having extended fragrance character impressions, comprising:
    A) a pro-accord component comprising:
    i) from 0.1% to 99% by weight, of one or more pro-accords formed from at least one fragrance raw material, said pro-accord releasing upon hydrolysis at least two fragrance raw materials selected from the group consisting of primary, secondary, and tertiary alcohols, aldehydes, ketones, esters, carbonates, and mixtures thereof, provided each pro-accord:
    a) is formed from at least one fragrance raw material having a molecular weight greater than or equal to about 100 g/mol;
    b) has a molecular weight greater than or equal to about 300 g/mol;
    c) has a molecular weight at least two times greater than the lowest molecular weight fragrance raw material which comprises said pro-accord;
    d) has a fragrance release half-life of less than or equal to about 12 hours at pH 2.5 or greater than or equal to about 0.1 hour at pH 5.3 when measured in NaH2PO4 buffer;
    ii) the balance carriers, stabilizers, and other adjunct ingredients whereby said pro-accord component is provided with an amount of reserve alkalinity equal to at least 0.001 molar NaOH;
    B) a fragrance raw material component comprising:
    i) from 0.1% to about 99% by weight, of a mixture of base note fragrances;
    ii) from 0.1% to about 99% by weight, of one or more top and middle note fragrances;
    ii) the balance carriers, fixatives, and other adjunct ingredients; and
    C) from 0.1% to about 99% by weight, of a cyclic pro-perfume according to Claim 1.
EP99906824A 1998-02-24 1999-02-08 Novel cyclic pro-perfumes having modifiable fragrance raw material alcohol release rate Expired - Lifetime EP1056739B1 (en)

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US7570898P 1998-02-24 1998-02-24
US75708P 1998-02-24
PCT/US1999/002732 WO1999043667A1 (en) 1998-02-24 1999-02-08 Novel cyclic pro-perfumes having modifiable fragrance raw material alcohol release rate

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EP1056739B1 true EP1056739B1 (en) 2003-05-02

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US6544945B1 (en) 2003-04-08
JP2002504548A (en) 2002-02-12
CA2322511A1 (en) 1999-09-02
ES2197620T3 (en) 2004-01-01
AR018111A1 (en) 2001-10-31
DE69907420T2 (en) 2004-03-11
BR9908219A (en) 2000-10-24
CN1298400A (en) 2001-06-06
DE69907420D1 (en) 2003-06-05
WO1999043667A1 (en) 1999-09-02
EP1056739A1 (en) 2000-12-06

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